US6733265B1 - Electric precision injection unit - Google Patents

Electric precision injection unit Download PDF

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Publication number
US6733265B1
US6733265B1 US10/070,085 US7008502A US6733265B1 US 6733265 B1 US6733265 B1 US 6733265B1 US 7008502 A US7008502 A US 7008502A US 6733265 B1 US6733265 B1 US 6733265B1
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US
United States
Prior art keywords
screw sleeve
shaft
injection molding
spindle nut
housing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
Application number
US10/070,085
Inventor
Holger Schmidt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DAMAG ERGOTECH GmbH
Sumitomo SHI Demag Plastics Machinery GmbH
Original Assignee
Demag Ergotech GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Demag Ergotech GmbH filed Critical Demag Ergotech GmbH
Assigned to DEMAG ERGOTECH WIEHE GMBH reassignment DEMAG ERGOTECH WIEHE GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SCHMIDT, HOLGER
Assigned to DAMAG ERGOTECH GMBH reassignment DAMAG ERGOTECH GMBH MERGER (SEE DOCUMENT FOR DETAILS). Assignors: DEMAG ERGOTECH WIEHE GMBH
Application granted granted Critical
Publication of US6733265B1 publication Critical patent/US6733265B1/en
Assigned to DEMAG ERGOTECH GMBH reassignment DEMAG ERGOTECH GMBH CORRECTION TO THE SPELLING OF THE ASSIGNEE Assignors: DEMAG ERGOTECH WIEHE GMBH
Assigned to MARMOR 220. VV GMBH reassignment MARMOR 220. VV GMBH MERGER (SEE DOCUMENT FOR DETAILS). Assignors: DEMAG ERGOTECH GMBH
Assigned to SUMITOMO (SHI) DEMAG PLASTICS MACHINERY GMBH reassignment SUMITOMO (SHI) DEMAG PLASTICS MACHINERY GMBH CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: MARMOR 220. VV GMBH
Adjusted expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/47—Means for plasticising or homogenising the moulding material or forcing it into the mould using screws
    • B29C45/50—Axially movable screw
    • B29C45/5008—Drive means therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C2045/1784—Component parts, details or accessories not otherwise provided for; Auxiliary operations not otherwise provided for
    • B29C2045/1792—Machine parts driven by an electric motor, e.g. electric servomotor

Definitions

  • the invention is directed to a precision injection unit for a machine for producing molded articles with a drive device for the rotation of the worm and a drive device for the axial movement of the worm.
  • DE 42 06 966 discloses an injection unit with only one drive motor for the axial and radial movement of the worm.
  • the rotating movement of the worm is carried out by the motor via a belt drive, one belt drive being connected with the worm shaft by a splined shaft section in a positive engagement, but so as to be axially displaceable.
  • the rear part of the worm shaft is constructed as a ball spindle and engages with the corresponding spindle nut.
  • the ball spindle nut is supported in the frame so as to be rotatable and can be secured by a claw coupling relative to the frame.
  • a spring element constantly presses the ball spindle with the spindle nut axially against the frame.
  • the coupling is not engaged.
  • the coupling is activated, so that the worm is compelled to move axially when the motor rotates. Only a very slight small axial lift or stroke is achieved in this construction.
  • EP 0 427 866 to which U.S. Pat. No. 5,129,808 corresponds, describes an injection unit with a metering motor and an injection motor which is constructed as a dual-platen injection unit.
  • the injection unit has a fixed platen in which two ball spindles arc secured axially and a movable platen with two linear guides which are connected with one another via the ball spindles and associated ball spindle nuts.
  • the metering motor is fastened to the movable platen and drives the worm (in rotation) via a belt drive.
  • the injection motor is fastened to the fixed platen and drives the two ball spindles via a belt drive for the axial injection movement of the movable platen.
  • the described injection unit has a complicated mechanical construction and, accordingly, a great many movable elements which results in increased maintenance and wear. Since the injection motor must move very massive parts of the injection unit, the mass moment of inertia is also high and accordingly limits effectiveness and efficiency.
  • the object of the invention is to provide an above-average, economically operating and reliable precision injection unit using features which are known in part.
  • a drive shaft with a cylindrical connection for the worm coupling is mounted so as to be freely rotatable at the other end along with a splined shaft section in a screw sleeve with two axial load-bearing capability rolling bearings.
  • the splined shaft section of the shaft engages with a complementary axial splined shaft coupling which is connected, via a gear unit, to the servo motor for the rotating movement of the worm.
  • the screw sleeve preferably a planetary roll spindle, engages with a complementary spindle nut.
  • the spindle nut is freely rotatable in the housing of the drive block of the injection unit with two axial load-bearing rolling bearings.
  • a servo motor drives the spindle nut by means of a belt drive and, depending on the rotating direction, the screw sleeve and, therefore, also the plastifying worm moves axially in one or the other direction, since the screw sleeve operates as a means for preventing rotation which is guided in a housing groove and therefore prevents the screw sleeve from participating in rotation.
  • the axial movement (injection/metering or influencing of the pressure profile of the melt) and the rotation of the worm (plastifying) can be carried out completely independent from one another.
  • FIG. 1 is a simplified view of the drive block of the injection unit
  • FIG. 2 shows a practical construction
  • FIG. 3 shows a section along line A—A.
  • the shaft 1 has a cylindrical part 16 for the connection of the worm coupling, not shown, at one end and a splined shaft profile at the other end.
  • the shaft 1 is supported in the screw sleeve 8 by the shaft bearings 2 and can rotate independent from it.
  • the radial forces and the high axial forces occurring particularly during injection are conducted into the screw sleeve 8 by the shaft bearings 2 .
  • the axial splined shaft coupling 3 engages with the splined shaft profile of the shaft 1 .
  • the axial splined shaft coupling 3 is fixedly connected with the drive shaft of the gear unit 4 which is screwed to the housing 11 .
  • the torque of the electric motor 7 which is also fastened to the housing 11 Is transmitted to the gear unit 4 via the belt drives 5 and 6 .
  • the spindle nut 9 engages with the screw sleeve 8 and is supported in the housing 11 by the spindle nut bearing 10 so as to be rotatable.
  • the high axial forces occurring during the injection are conducted into the housing 11 via the spindle nut bearing 10 .
  • the spindle nut 9 has a flange to which the belt drives 13 and 14 are flanged and the torque can accordingly be transmitted from the electric gear unit motor 15 fastened to the housing 11 and from the belt drive.
  • the housing 11 has a block 12 which is received in an axially extending groove in the screw sleeve 8 and prevents the screw sleeve 8 from rotating along during rotation of the spindle nut 9 and shaft 1 .
  • a pressure sensor is provided at a bearing loaded by axial force for direct instantaneous measurement of axial force.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Dental Preparations (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

An injection molding device with an injection molding cylinder in which is arranged a coaxial worn that is rotatable and axially displaceable by drive devices. A spindle nut rotatable by a first drive device is mounted in a housing and cooperates with a screw sleeve which is axially displaceable during rotation of the spindle nut but is fixed against rotation during axial displacement. Further, a shaft is mounted in the interior of the screw sleeve and is connected at one end to the worm and has at the other end an axial coupling, one of whose coupling parts communicates with a second drive device.

Description

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is directed to a precision injection unit for a machine for producing molded articles with a drive device for the rotation of the worm and a drive device for the axial movement of the worm.
2. Description of the Related Art
DE 42 06 966 discloses an injection unit with only one drive motor for the axial and radial movement of the worm. The rotating movement of the worm is carried out by the motor via a belt drive, one belt drive being connected with the worm shaft by a splined shaft section in a positive engagement, but so as to be axially displaceable.
The rear part of the worm shaft is constructed as a ball spindle and engages with the corresponding spindle nut. The ball spindle nut is supported in the frame so as to be rotatable and can be secured by a claw coupling relative to the frame. A spring element constantly presses the ball spindle with the spindle nut axially against the frame.
During the plastifying process for plastic, the coupling is not engaged. During the injection process, the coupling is activated, so that the worm is compelled to move axially when the motor rotates. Only a very slight small axial lift or stroke is achieved in this construction.
Further, it must be viewed as a disadvantage that the worm rotation and the axial position can not be influenced independent from one another.
EP 0 427 866, to which U.S. Pat. No. 5,129,808 corresponds, describes an injection unit with a metering motor and an injection motor which is constructed as a dual-platen injection unit. The injection unit has a fixed platen in which two ball spindles arc secured axially and a movable platen with two linear guides which are connected with one another via the ball spindles and associated ball spindle nuts. The metering motor is fastened to the movable platen and drives the worm (in rotation) via a belt drive.
The injection motor is fastened to the fixed platen and drives the two ball spindles via a belt drive for the axial injection movement of the movable platen.
The described injection unit has a complicated mechanical construction and, accordingly, a great many movable elements which results in increased maintenance and wear. Since the injection motor must move very massive parts of the injection unit, the mass moment of inertia is also high and accordingly limits effectiveness and efficiency.
SUMMARY OF THE INVENTION
Proceeding from the problems and disadvantages described above, the object of the invention is to provide an above-average, economically operating and reliable precision injection unit using features which are known in part.
An extremely compact construction of the drive block of the injection unit which is limited to a minimum of parts is achieved by integrating two drive devices for axial movement and worm rotation, wherein it is possible to achieve a temporary flow of force. High efficiency and high availability are achieved in this way.
A drive shaft with a cylindrical connection for the worm coupling is mounted so as to be freely rotatable at the other end along with a splined shaft section in a screw sleeve with two axial load-bearing capability rolling bearings. The splined shaft section of the shaft engages with a complementary axial splined shaft coupling which is connected, via a gear unit, to the servo motor for the rotating movement of the worm.
The screw sleeve, preferably a planetary roll spindle, engages with a complementary spindle nut. The spindle nut is freely rotatable in the housing of the drive block of the injection unit with two axial load-bearing rolling bearings. A servo motor drives the spindle nut by means of a belt drive and, depending on the rotating direction, the screw sleeve and, therefore, also the plastifying worm moves axially in one or the other direction, since the screw sleeve operates as a means for preventing rotation which is guided in a housing groove and therefore prevents the screw sleeve from participating in rotation.
The axial movement (injection/metering or influencing of the pressure profile of the melt) and the rotation of the worm (plastifying) can be carried out completely independent from one another.
The shortest possible flow of force with the smallest mass moment of inertia combined with high efficiency and low maintenance is achieved by means of this construction.
Only the selected construction length of the screw sleeve, and the length of the splined shaft profile coupling which is adapted to it, limits (a drive block) the possible injection stroke of the worm.
An embodiment example of the invention is shown in the drawings and described in the following.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a simplified view of the drive block of the injection unit;
FIG. 2 shows a practical construction;
FIG. 3 shows a section along line A—A.
DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS
The shaft 1 has a cylindrical part 16 for the connection of the worm coupling, not shown, at one end and a splined shaft profile at the other end. The shaft 1 is supported in the screw sleeve 8 by the shaft bearings 2 and can rotate independent from it. The radial forces and the high axial forces occurring particularly during injection are conducted into the screw sleeve 8 by the shaft bearings 2.
The axial splined shaft coupling 3 engages with the splined shaft profile of the shaft 1. The axial splined shaft coupling 3 is fixedly connected with the drive shaft of the gear unit 4 which is screwed to the housing 11. The torque of the electric motor 7 which is also fastened to the housing 11 Is transmitted to the gear unit 4 via the belt drives 5 and 6.
The spindle nut 9 engages with the screw sleeve 8 and is supported in the housing 11 by the spindle nut bearing 10 so as to be rotatable. The high axial forces occurring during the injection are conducted into the housing 11 via the spindle nut bearing 10.
The spindle nut 9 has a flange to which the belt drives 13 and 14 are flanged and the torque can accordingly be transmitted from the electric gear unit motor 15 fastened to the housing 11 and from the belt drive.
The housing 11 has a block 12 which is received in an axially extending groove in the screw sleeve 8 and prevents the screw sleeve 8 from rotating along during rotation of the spindle nut 9 and shaft 1.
When the spindle nut 9 is set in rotation, the screw sleeve 8 must compulsorily move with the shaft 1 in axial direction.
A pressure sensor is provided at a bearing loaded by axial force for direct instantaneous measurement of axial force.
The arrangement and construction of the drive devices and belt drives are shown particularly in the practical construction shown in FIGS. 2 and 3.

Claims (5)

I claim:
1. An injection molding apparatus comprising
a housing,
a screw sleeve which is axially displaceable with respect to said housing,
means for preventing rotation of said screw sleeve with respect to said housing,
a shaft which is mounted concentrically in said screw sleeve and is axially fixed but rotatable with respect to said screw sleeve, said shaft having one end for carrying a worm in a molding cylinder and an axially opposed end,
a spindle nut which cooperates with said screw sleeve to axially displace said screw sleeve with respect to said housing when said spindle nut is rotated,
a first drive device for rotating said spindle nut, thereby axially displacing said shaft,
an axial coupling on said opposed end which is rotatably fixed but axially displaceable with respect to said opposed end, and
a second drive device for rotating said axial coupling, thereby rotating said shaft.
2. An injection molding apparatus as in claim 1 wherein each of said first and second drive devices comprises an electric motor.
3. An injection molding apparatus as in claim 2 wherein each said electric motor is a servo motor.
4. An injection molding apparatus as in claim 1 wherein said opposed end of said shaft is splined.
5. An injection molding apparatus as in claim 1 wherein said screw sleeve is constructed as a ball roll spindle.
US10/070,085 1999-09-08 2000-08-29 Electric precision injection unit Expired - Fee Related US6733265B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19943709A DE19943709C2 (en) 1999-09-08 1999-09-08 Precision injection unit
DE19943709 1999-09-08
PCT/DE2000/002996 WO2001017746A1 (en) 1999-09-08 2000-08-29 Electric precision injection unit

Publications (1)

Publication Number Publication Date
US6733265B1 true US6733265B1 (en) 2004-05-11

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US10/070,085 Expired - Fee Related US6733265B1 (en) 1999-09-08 2000-08-29 Electric precision injection unit

Country Status (7)

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US (1) US6733265B1 (en)
EP (1) EP1210219B1 (en)
JP (1) JP2003508262A (en)
AT (1) ATE238149T1 (en)
AU (1) AU7506900A (en)
DE (2) DE19943709C2 (en)
WO (1) WO2001017746A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040142056A1 (en) * 2003-01-17 2004-07-22 Fanuc Ltd. Injection molding machine
US20110018156A1 (en) * 2008-03-31 2011-01-27 Toyo Machinery & Metal Co., Ltd. In-Line Screw Type Injection Molding Machine and Method of Controlling the Same
US20110086125A1 (en) * 2009-10-09 2011-04-14 Jin-Hsiang Wang Injection drive apparatus for injection molding machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2045064A1 (en) * 2007-10-01 2009-04-08 Siemens Aktiengesellschaft Injection moulding machine
CN109713840B (en) * 2019-01-23 2020-04-10 济南中正金码科技有限公司 Servo pressure cylinder rod rotation preventing device

Citations (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4741685A (en) * 1985-11-30 1988-05-03 Fanuc Ltd Injection drive apparatus
US5129808A (en) 1989-05-24 1992-07-14 Fanuc Ltd. Two-plate type injection apparatus
DE4206966A1 (en) 1991-04-29 1992-11-05 Tetra Pak Romont Drive for package making extruder
US5338174A (en) * 1991-04-10 1994-08-16 Battenfeld Gmbh Displacement and/or actuating force drive device for an injection molding machine
DE4344335A1 (en) 1993-12-23 1995-06-29 Krauss Maffei Ag Injection unit for an injection molding machine
DE4409822A1 (en) 1994-02-19 1995-08-24 Procontrol Ag Drive unit for converting rotary into linear motion on injection moulding machine
US6059556A (en) 1997-07-16 2000-05-09 Toshiba Kikai Kabushiki Kaisha Injection apparatus for injection molding machine
US20020076465A1 (en) * 2000-11-27 2002-06-20 Axel Knauff Injection unit for an injection-molding machine
US20020119211A1 (en) * 2000-12-02 2002-08-29 Battenfeld Service Gmbh Injection unit for an injection molding machine
US6443722B1 (en) * 1999-09-07 2002-09-03 Negri Bossi S.P.A. Electric injection assembly for injection presses for plastic materials
US6461139B1 (en) * 1999-09-22 2002-10-08 Nissei Plastic Industrial Co., Ltd. Pressure detection apparatus of injection molding machine
US6517336B1 (en) * 1998-06-16 2003-02-11 Sumitomo Heavy Industries, Ltd. Injection molding machine having coaxial injection motor and transmission shaft
US6562261B2 (en) * 2000-04-04 2003-05-13 Sumitomo Heavy Industries, Ltd. Injection molding method and control system for injection molding machines

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JPS61266218A (en) * 1985-05-22 1986-11-25 Sumitomo Heavy Ind Ltd Injection molding machine
JPH01249419A (en) * 1988-03-31 1989-10-04 Nissei Plastics Ind Co Injection device of injection molder
JP2667558B2 (en) * 1990-07-09 1997-10-27 住友重機械工業株式会社 Injection device of electric injection molding machine
AT219U1 (en) * 1994-06-30 1995-05-26 Engel Maschinenbau Ges M B H E INJECTION UNIT FOR INJECTION MOLDING MACHINES
DE19605747C2 (en) * 1996-02-16 1998-08-06 Ferromatik Milacron Maschinenb Drive unit for plasticizing and injection units of plastic injection molding machines

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US4741685A (en) * 1985-11-30 1988-05-03 Fanuc Ltd Injection drive apparatus
US5129808A (en) 1989-05-24 1992-07-14 Fanuc Ltd. Two-plate type injection apparatus
US5338174A (en) * 1991-04-10 1994-08-16 Battenfeld Gmbh Displacement and/or actuating force drive device for an injection molding machine
DE4206966A1 (en) 1991-04-29 1992-11-05 Tetra Pak Romont Drive for package making extruder
US5540495A (en) * 1993-12-23 1996-07-30 Krauss Maffei Aktiengesellschaft Injection assembly for an injection molding machine
DE4344335A1 (en) 1993-12-23 1995-06-29 Krauss Maffei Ag Injection unit for an injection molding machine
DE4409822A1 (en) 1994-02-19 1995-08-24 Procontrol Ag Drive unit for converting rotary into linear motion on injection moulding machine
US6059556A (en) 1997-07-16 2000-05-09 Toshiba Kikai Kabushiki Kaisha Injection apparatus for injection molding machine
US6517336B1 (en) * 1998-06-16 2003-02-11 Sumitomo Heavy Industries, Ltd. Injection molding machine having coaxial injection motor and transmission shaft
US6443722B1 (en) * 1999-09-07 2002-09-03 Negri Bossi S.P.A. Electric injection assembly for injection presses for plastic materials
US6461139B1 (en) * 1999-09-22 2002-10-08 Nissei Plastic Industrial Co., Ltd. Pressure detection apparatus of injection molding machine
US6562261B2 (en) * 2000-04-04 2003-05-13 Sumitomo Heavy Industries, Ltd. Injection molding method and control system for injection molding machines
US20020076465A1 (en) * 2000-11-27 2002-06-20 Axel Knauff Injection unit for an injection-molding machine
US20020119211A1 (en) * 2000-12-02 2002-08-29 Battenfeld Service Gmbh Injection unit for an injection molding machine

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Patent Abstracts of Japan, vol. 011, No. 125, JP 61266218, Nov. 1986.
Patent Abstracts of Japan, vol. 016, No. 274, JP 04067928, Mar. 1992.

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040142056A1 (en) * 2003-01-17 2004-07-22 Fanuc Ltd. Injection molding machine
US7074028B2 (en) * 2003-01-17 2006-07-11 Fanuc Ltd Injection molding machine having a freely rotatable screw
US20110018156A1 (en) * 2008-03-31 2011-01-27 Toyo Machinery & Metal Co., Ltd. In-Line Screw Type Injection Molding Machine and Method of Controlling the Same
US8075817B2 (en) * 2008-03-31 2011-12-13 Toyo Machinery & Metal Co., Ltd. In-line screw type injection molding machine and method of controlling the same
US20110086125A1 (en) * 2009-10-09 2011-04-14 Jin-Hsiang Wang Injection drive apparatus for injection molding machine
US7942659B2 (en) * 2009-10-09 2011-05-17 Hwa Chin Machinery Factory Co., Ltd. Injection drive apparatus for injection molding machine

Also Published As

Publication number Publication date
AU7506900A (en) 2001-04-10
ATE238149T1 (en) 2003-05-15
DE50001904D1 (en) 2003-05-28
WO2001017746A1 (en) 2001-03-15
DE19943709C2 (en) 2002-07-18
JP2003508262A (en) 2003-03-04
EP1210219B1 (en) 2003-04-23
EP1210219A1 (en) 2002-06-05
DE19943709A1 (en) 2001-05-31

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Owner name: DEMAG ERGOTECH WIEHE GMBH, GERMANY

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